The 6304 ZZ CM NSK is a ball bearing with an internal diameter of 20mm, an outer diameter of 52mm, and a width of 15mm. It is made from bearing steel and is manufactured by NSK. This bearing is designed to provide high-quality support for various rotating components, such as motors, fans, pumps, and blowers. This bearing is designed to run smoothly without wear and tear and will work reliably in temperatures ranging from -40°C to 200°C.